Spiral propelleb for ships



JHN J. TOBIN AND FRANK J. GALLAGHEI-t, OF SAYRE, PENNSYLVANIA.

SPIRAL PROPELLEB. FOR SHIPS.

Specification of Letters Patent.

Patented Aug. 29, 1916.

To ZZ whom it may concern:

Be it known that we, JOHN J. TosrN and FRANK J. GALLAGHER, citizens of the 1United States, residing at Sayre, in the county of Bradford and State of Pennsylvania, have invented certain new and useful Improvements in Spiral Propellers for Ships, of which the followingT is a specification.

The primary purpose of this invention is the provision of novel propelling means for ships and water craft generally whereby the speed of such carriers is increased and the liabilityv of injury to the propeller'reduced by having the same inclosed.

ln accordance with this invention the propeller is of screw or spiral formation and is inclosed in a suitable casing through which the water is caused vto pass, thereby obtaining a two-fold action, the one resulting from drawing the water into the casing and the other from forcing the water from the casingl against that in the rear thereof.

With these and other objects in view, which will readily-appear as the nature of the invention is better understood, the. same consists in the improved construction and novel arrangement and combination of parts which will be hereinafter fully described and particularly claimed.

ln the accompanying drawings has been illustrated aV simple and preferred form of the invention, it being, however, understood that no limitation is necessarily made to the precise structural details therein exhibited, but that changes, alterations and modifications within the scope of the invention as claimed .may be resorted to when desired.

Referring to the drawings,-Figure 1 is a view in elevation of a ship provided with propelling means embodying the invention, the casing for the screw propeller being in section; Fig. 2 is a top plan view of axnodification; Fig. il is a side viewlof the modification illustrated in Fig. 2; Fig. l is a detail view of the propeller on a larger scale; Fig. 5 is a fragmentary View of a further modification; Fig. 6 is a detail view in elevation of the modification shown inFig; 5.

eorresponding and like parts are referred to in the following description and indicated in all the views of the drawings by the same reference characters.

Referring;f to Fig. l, the numeral l designates the hull of a ship or sea going vessel. fl. screw propeller 2- is located in line with :he heel of the ship and extends practically shaft having a flight orv wing extending spirally therearound. A casing 4 extending 'the entire length of the vessel receives the screw propeller 2. The water isdrawn into the forward end of the casing by means of the propeller and is forced through thel easing and discharged lfrom the'rear end thereof by the action of the propeller. The drawing of the Water into the casing 4 tends to create a reduced pressure in advance of the vessel which draws the vessel forward while the discharge of the water at the rear of the casing by impact with the water in the rear of the vessel tends to push the latter forward. It will thus be understood that the vessel is actuated by a dual force, the one drawing, the other pushing. By havin the propellerv incased it is also protected from injury by coming in Contact with objects that may be floating in the water. The propeller may be driven in any manner.

In the xnodication shown in Fig. 2 four propeller-s L are provided and disposed two upon each side of the vessel, the one at or near the bow and the other at or nearthe stern. T his results in two bow propellers and two stern propellers. The bow propellers are oppositely inclined as are also the stern propellers but the latter incline in an inverse direction to the former. Longitudinal shafts 5 are disposed along the sides of the. vessel and are connecte( at their ends by means of universal joints (i with the shafts of the respective bow and Stern propellers. The several propellers are of like formation, each embodying a shaft 7, a` spiral, or screw flight or wing, 8 secured to the shaft 7 and a suitable casing i), the latter inolosiupr the propeller proper and being open throughout its length. The shaft 7 may be mounted in anti-friction bearings, as indicated at l0, and such bearings are protected by means of tapering guards ll which act as deflectors to minimize the resistance of the shaft and bearings to the forward movement of the vessel.

ln the modification shown in Figs. 5 and (3 the propeller 12 is similar in formation to the propellerY hereinbefore (lescrilieil, the same comprising a shaft and a flight or wing extending;r spirally thercoround. This propeller is preferably disposed in advance of the bow of the vessel and in line with the keeh A casing 13 incloses the propeller 1Q and serves to confine the'water which is drawn into the casing at its forward end and discharge therefrom at its rear end.

Tubular conductors 14 extend along the sides of the bow of the hull 15 and receive "the water from the casing 13 with which rear of the bow. Thecombined area or caf.

The tubular conductors 14:

of the hull and discharge the water inthe pacity of the tubular conductors 14 is about equal to that of the casin 13 so as to carry oli' the waterv delivered t erein from such casing. v

It will be understood that the invention provides a propeller for ships which -Inaterially increases the speed thereof without requiring,r a proportionate increase 'in the power required for driving the propeller. lt is also observed that the propeller being incascd is protected from injury from ex.

tel-nal objects. It is further observed that the action of the propeller is two-foldand serres to propel the boat by creating a reduced press-ure in advance thereof and by the ilu-part of the water vagainst that in the rear of the boat so that the. vessel is both d ruwn and 'pushed 'fuorwardg l'laving thus describedthe invention, what iscluilned as new is 1.` A propeller for boats including a tubu lar casing, a lshaft extending axially of the casing, a spiral propeller blade carried by the shaft,` and a substantially conical hood disposed in advance of the casing and free of connection to the shaft7 the hood being of less diameter than thedcasing.

2. ln ship propulsion, therOInbination- .y cal screw propellers mounted in each er tudinally of the hull and projecting at their with a ship hull, of parallel lshafts extending longitudinally of the hull land projecting at their ends throughthe sides of the hull adjacent the bow and stern, means within the hull for independently rotatingr the shafts, tubular housings disposed at either side of the bowvof the ship and conerging forwardly toward each other, helihousings and having universal joint `n ections with the shafts, tubular. housi mounted upon the sides of the hull adiacenti 5o .the stern and converging rearwardly toward each athen helical screw. propeller's mount- ,ed in the 'latter housings and having universaljoint connections withl the shafts, and substantially conical hoods disposed in advance 'of all the housings.

3. In propulsion, the combination with a ship'hull, of shafts extending lengt ends through the Sidesof the hull adjacent the bow and stern, means for .driving the shafrtsQ/tubular housings disposed atieither side' of the'bow of the vship 'and converging forwardly toward eachother, helicalscrew propeller-s mounted in eachof the housings and having-universal joint-connections with the shafts, tubular hOuSingsnounted upon the sides of the hull adjacentl the stern and converging rearwardly.` toward each other', and helical screw propelers mounted inthe universal )omt latter housings andv having connections with the shafts.

.In testimony Awhereo,}we aiiix our signatures. ,Y

JOHN J. ToBIN; [Le] FRANK J. GALIJAGHER. pr 5.] 

